To keep a clear mind, can not be easily fooled.

要保持清醒头脑，不能被轻易忽悠。

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In the same time, we become closer to nature which will help us keep a clear mind in thinking.

在同一时间，我们更加紧密的性质，这将有助于我们保持清醒的头脑，在思想。

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Let's keep a clear mind by reading history, pass the spirit and take on the holy mission from the history!

让我们读史明志，让我们传承精髓，共同担负起历史赋予我们的神圣使命！

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You can see that as you fill up your periodic table, it's very clear. But also we'll tell you a pneumonic device to keep that in mind, so you always remember and get the orbital energy straight.

在你们填周期表的时候，非常清楚但是我们也要告诉你们,一个策略去记住它，所以你们总是记得,并得到连续的轨道能量。

麻省理工公开课 - 化学原理课程节选

"At a time like this, when people are grieving, I think it's hard to keep a clear mind on anything, " Steenkamp said.

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